Denoting a substance capable of readily absorbing and retaining moisture; e.g., NaOH, CaCl2.
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hy·gro·scop·ic .hī-grə-'skäp-ik adj readily taking up and retaining moisture <glycerol is \hygroscopic>
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hy·gro·scop·ic (hi″gro-skopґik) taking up and retaining moisture readily.Medical dictionary. 2011.